pginfo <pginfo@t1.unisoftbg.com> writes:
> I was supprised that the pgsql trigger take ~8 sec. to insert this rows
> and the "C" trigger take ~ 17 sec.
The reason is that plpgsql caches the plan for the invoked SELECT,
whereas the way you coded the C function, it's re-planning that SELECT
on every call.
regards, tom lane
